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x in (-oo:+oo)
5/1 = x/15 // - x/15
5/1-(x/15) = 0
5-(x/15) = 0
5-1/15*x = 0 // - 5
-1/15*x = -5 // : -1/15
x = -5/(-1/15)
x = 75
x = 75
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